All releases of SeaMonkey

Release Notes: New features include a Gamepad API, CSS3 variables, Promises, "number" and "color" input fields in HTML forms, and the option not to strip signatures when replying to messages. There were also several fixes to stability issues.

Release Notes: In this release,
newsgroup names can now be entered using autocompletion.
The Gamepad API has been finalized and enabled,
and VP9,
Opus,
and HTML5 volume control are
now implemented.
There are various new features to HTML forms and MathML,
and several stability issues have
been fixed.

Release Notes: There is now support for Atom Threading Extensions, better support for migrating profiles from Thunderbird, and several improvements to the autocomplete and mail/news user interfaces. TLS 1.1 and TLS 1.2 are enabled by default, and support for the SPDY 3.1 has been added. Besides this, there are several other new features, stability fixes, and security fixes.

Release Notes: All plugins are now defaulted to click-to-play. Page load times have been improved. Support for H.264 on Linux, and support for MP3 on Windows XP. The password manager supports script-generated password fields. Download progress is now shown in the Mac OS X app dock icon. EXIF orientation is now being used when displaying attached images in MailNews. MailNews notifications have a new look. Plus several bugfixes and improvements to stability and standards compliance.

Release Notes: This release adds Web Audio and CSS3 background-attachment:local support,
many new ES6 functions,
and a "Validate this page" command.
iframe content can now be specified inline.
Sorting messages by date can now be configured to look at the thread root.
Plugins doorhangers now allow activating different plugin types independently.
The proxy popup is now also available from the MailNews main window.
A new Recipients column has been added which shows all recipients.
The default HTML5 A/V player can change the playback rate.
The Firefox devtools debugger can now be used to debug SeaMonkey remotely.

Release Notes: Implements an option to thread messages received by date. Allows deletion of news posts by default.
Implements optional taskbar preview-per-tab.
Adds support (permission prompt) for desktop notifications. Adds an Isn't operator for searching by priority. Support for a new scrollbar style on Mac OS X 10.7 and newer. Accessibility-related improvements on using pinned tabs. Major SVG rendering improvements around Image tiling and scaling. Removes support for sherlock files that are loaded from application or profile directory. Support for W3C touch events is disabled.

Release Notes: The Content Security Policy (CSP) 1.0 parser has been enabled.
The Mixed Content Blocker has been enabled, blocking insecure active content loads on HTTPS pages.
New mail alert information can be customized now (Preferences/Mail & Newsgroups/Notifications).
A confirmation prompt has been introduced to protect against accidental permanent data loss when force-deleting messages using Shift+Del.
The MailNews Save As Template supports multiple selections now.
The size on disk is now shown for newsgroup folders.

Release Notes: Mark -> As Read now checks the state of all selected messages instead of only the first one's. Notifications for a mixed content blocker have been implemented. A new third-party cookie restriction to visited websites option has been added to the Cookies pref pane. The context menu Search option is now available for textareas and input fields. Website storage mechanisms are now available in the Data Manager (localStorage, indexedDB, etc.). "Open Containing Folder" is now already available during download. Several changes were made to the Mozilla platform.

Release Notes: OS X 10.6 is now the minimum supported Mac version.
JavaScript Maps and Sets are now iterable.
SVG FillPaint and StrokePaint have been implemented.
The sandbox attribute has been implemented for iframes, enabling increased security. Plugins can be set to click-to-play (instead of blocked completely) automatically through the blocklist now.

Release Notes: JavaScript responsiveness has been improved through incremental garbage collection. CSS3 animations, transitions, transforms, and gradients have been unprefixed. MD5 is no longer supported as a hash algorithm in digital signatures. The Opus codec is now supported by default. The reverse CSS3 animation direction has been implemented. Per-tab reporting is now available in about:memory. Several stability issues have been fixed.